| OR (95% CI) | p-value | |
| Model for “absolute” response | ||
| Age | 0.97 (0.94–1.00) | 0.068 |
| BI-baseline | 1.04 (1.03–1.06) | 0.000 |
| Currow | 1.52 (0.59–3.85) | 0.382 |
| Johnson | 2.68 (0.45–15.95) | 0.278 |
| Oxberry | 3.03 (1.12–8.19) | 0.031 |
| Model for “relative” response | ||
| Age | 0.96 (0.93–1.00) | 0.025 |
| BI-baseline | 1.03 (1.02–1.05) | 0.000 |
| Currow | 2.04 (0.85–4.90) | 0.109 |
| Johnson | 4.38 (0.80–24.13) | 0.090 |
| Oxberry | 2.09 (0.84–5.18) | 0.113 |
Standard error adjusted for 166 clusters in “study”. The odds ratio indicates whether the patients with that characteristic were more (>1) or less (<1) likely to respond to morphine, e.g. those with “more” age (older) were less (<1) likely to respond to morphine. BI: breathlessness intensity.